Did you know sunscreen has a shelf life and can expire? Or that too much heat or cold can ruin a new bottle?
Protecting your skin from harmful sun rays will help against inflammation, burns, premature aging and, most importantly, skin cancer.
Dr. Dawn Davis, a Mayo Clinic dermatologist, has more on sunscreen shelf life and other facts to help make decisions as you head into the sun.
You might think a dermatologist is going to ask you to ban the sun.
"There's nothing wrong with being outside in the sun," says Dr. Davis.
UV, or ultraviolet light, is a carcinogen. That's where sunscreen helps.
"Sunscreen can act as a carcinogen barrier to help keep your skin safe," says Dr. Davis.
Keep these sunscreen facts in mind when you're reaching for your favorite bottle:
Bottom line, everyone over age 6 months needs sunscreen — babies included.
"It is a layman's myth that children do not get skin cancer. And it's a layman's myth that a person of color cannot have skin cancer," Dr. Davis says.
And lastly, Dr. Davis says, "There literally is no such thing as a waterproof sunscreen."
Apply sunscreen, and after you get wet, reapply.
To be effective, sunscreen needs to be used liberally so be generous with your portions.
It's recommended to use 1 ounce (30 milliliters) of sunscreen — the amount in a shot glass — to cover exposed parts of the body. You might need to apply more, depending on your body size. If you have a 4-ounce (118-milliliter) bottle, you'll use about a quarter of it during one application.